Quick answer: Prone means lying flat, face down, or (figuratively) likely to suffer from or do something: He lay prone on the examination table; she is prone to headaches. Supine means lying flat, face up, on one's back, or (figuratively) passive and unwilling to act: He lay supine, staring at the ceiling; the council was criticised for its supine response. For a fuller definition, see the Cambridge Dictionary entry for ‘prone’.
Comparison Table
| Word | Part of Speech | Meaning | Example |
|---|---|---|---|
| prone | adjective | lying face down; also: likely to suffer from or do something | She is prone to catching colds in winter. |
| supine | adjective | lying face up, on one's back; also: passive, submissive, failing to act | The patient was placed in a supine position. |
Using Prone
Prone most literally describes lying flat with the front of the body facing downward. Figuratively, "prone to" means naturally likely to experience or do something, often something negative.
The soldier crawled forward in the prone position.
He is prone to exaggeration when telling stories.
People with this condition are more prone to injury.
She lay prone on the beach, sunbathing on her stomach.
Using Supine
Supine literally describes lying flat on one's back, face upward. Figuratively, it describes a passive, weak, or submissive failure to act or resist.
The doctor asked the patient to lie supine for the scan.
Critics accused the board of a supine response to the scandal.
He remained supine, staring up at the stars.
The opposition was criticised for its supine acceptance of the new law.
Memory Trick
PRONE face down — both "prone" and "down" have a similar short, blunt sound. SUPine face up — think "sup" rhymes loosely with "up", helping you recall it means facing upward.
Common Mistakes
✗ The patient lay supine, face down on the table.
✓ The patient lay prone, face down on the table.
✗ She is supine to making careless mistakes under pressure.
✓ She is prone to making careless mistakes under pressure.
Tips to Avoid Confusion
- Ask: is the body face down? Use prone.
- Ask: is the body face up? Use supine.
- Remember: only "prone" has the figurative sense of "likely to" (prone to accidents).
- "Supine" figuratively describes passive, weak inaction, often criticising a lack of resistance.
For more on related grammar, see adjectives. Also confusing: Above vs Over, Allowed vs Aloud, Assent vs Ascent. Browse all confusing word pairs →
Quick Check: Prone or Supine?
4 fill-in-the-blank questions — choose the correct word for each sentence.
1. “The soldier crawled in the ___ position, hugging the ground.” (face down)
2. “For the scan, the nurse asked him to lie ___.” (face up)
3. “She is ___ to seasickness on long ferry journeys.” (likely to)
4. “The committee's ___ response was widely criticised.” (passive)
Frequently Asked Questions
What is the difference between prone and supine?
Prone means lying face down, or, figuratively, likely to suffer from or do something: "He lay prone on the mat; she is prone to headaches." Supine means lying face up on one's back, or, figuratively, passive and unwilling to act: "He lay supine, staring upward; a supine response to criticism."
Which position is prone: face up or face down?
Prone means face down — lying flat with the front of the body against the surface below, such as the ground or a table.
Which position is supine: face up or face down?
Supine means face up — lying flat on one's back, with the front of the body facing upward, such as toward the ceiling or sky.
Can 'prone' mean something other than a body position?
Yes — 'prone' is very commonly used figuratively to mean 'likely to' or 'having a tendency toward', especially something undesirable: "accident-prone", "prone to error", "prone to flooding".
Can 'supine' mean something other than a body position?
Yes — figuratively, supine describes a passive, weak, or submissive failure to resist or act: "a supine parliament that failed to challenge the new powers".
Are prone and supine used in medical contexts?
Yes, very frequently. Medical professionals use 'prone position' and 'supine position' precisely to describe how a patient should lie during an examination, procedure, or scan, since the distinction matters for accuracy and safety.
Is there a third related position word?
Yes — 'lateral' (or 'recumbent') describes lying on one's side, distinct from both prone (face down) and supine (face up). Together these terms describe the main body positions used in medicine and anatomy.
Is prone ever confused with 'prostrate'?
Yes — prostrate also means lying flat, face down, often in submission or exhaustion, and shares a similar meaning to prone in some contexts, though prostrate often carries a stronger sense of submission, grief, or collapse.
Give a sentence using both words correctly.
"Exhausted from the hike, he collapsed prone onto the grass, before eventually rolling onto his back to lie supine and watch the clouds." This shows the clear physical contrast between the two positions.
How can I remember prone vs supine?
Prone sounds blunt like 'down' — think face down. Supine can be linked to 'up' (both contain the letter 'u' prominently, and 'sup' evokes looking 'up') — think face up. Also remember only 'prone' has the extra figurative sense of 'likely to'.